Duplex 2205, super duplex 2507 and S32760 are not interchangeable fastener grades. Super duplex offers a more highly alloyed material system, but the selection still depends on the actual exposure, mechanical requirements, processing route and approved design.
Request a Quote| Requirement | Duplex 2205 | Super duplex 2507 | Super duplex S32760 |
|---|---|---|---|
| UNS identity | S31803 / S32205 — specify permitted designation | S32750 | S32760 |
| Material family | Duplex stainless | Highly alloyed duplex stainless | Distinct super duplex with copper and tungsten additions |
| Forging reference | F51 — product-form reference | F53 — product-form reference | F55 — product-form reference |
| Selection focus | Approved chloride-exposed plant components | Approved offshore and seawater equipment | Designs explicitly calling for S32760 |
| Processing evidence | Treatment and phase-balance records | Treatment, microstructure and specified corrosion tests | Treatment, inspection and project qualification records |
A comparison helps frame the enquiry. The responsible engineer approves the material, condition and finished assembly.
Where the designer identifies a more demanding chloride exposure, super duplex may be part of the material review. Avoid selecting from a family label or a single corrosion index: fluid chemistry, crevices, loading, manufacturing condition and inspection all matter.
Seawater, offshore location or sour gas alone does not determine a universally acceptable grade. State the project’s service and qualification requirements before seeking a quote.
2507 denotes S32750; S32760 is a separate designation. Do not treat F53 and F55 as equivalent, and do not interpret an ASTM A182 forging reference as a complete finished-fastener specification.
Where NORSOK qualification is required, verify the relevant manufacturing route and records. A super-duplex UNS designation or visible marking does not prove qualification.
Send the complete requirement for a defined quotation. EMG confirms the supply and inspection scope against your project documents.
Request a QuoteOnly after engineering approval. The replacement must satisfy strength, corrosion, dimensions, companion nuts and processing requirements; a more highly alloyed family is not automatic permission to substitute.
No. 2507 is UNS S32750. S32760 has a different composition and identity, including copper and tungsten additions.
No. Markings support identification, but the certificate, heat traceability and agreed inspection records establish acceptance of the supplied components.
References support material identification, not acceptance of a finished component. Use the applicable standard edition and approved project specification. Alloy trademarks remain the property of their respective owners.
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